Using the phase diagram for CO2, what phase is carbon dioxide in at 20°C and 25 atm pressure?

A. It is at its melting point.

B. It is at its boiling point.

C. It is in the gas phase.

D. It is in the liquid phase.

Compare and contrast physical changes with chemical changes.

Name the intersection of plane bpq and plane cpq.

Consider the following reaction at equilibrium. 2co2 (g) 2co (g) + o2 (g) h° = -514 kj le châtelier's principle predicts that the equilibrium partial pressure of co (g) can be maximized by carrying out the reaction a. at high temperature and high pressure b. at high temperature and low pressure c. at low temperature and low pressure d. at low temperature and high pressure e. in the presence of solid carbon